1997 Mercedes Benz 200e Mis firing

DOUGSOLV

MEMBER
1997 MERCEDES BENZ 200E
4 CYL
2WD
AUTOMATIC
128,000 MILES

My merc is mis firing normally at low revs. Could it be a worn plug or a sensor or something else.

Wednesday, May 13th, 2009 AT 4:49 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.